msgexchange-v2/src/main/resources/logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- ACMA-8/ACMA-6：logstash TCP JSON 通道保留（字段兼容现网）+ MDC traceId -->
<!-- U12/N31b（顺序约束）：先加 Async + neverBlock 降级，再补热路径日志——
     否则 logstash 不可达时同步 TCP 发送会反向阻塞业务线程 -->
<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level [%X{traceId:-}] %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="LOGSTASH_SYNC" class="net.logstash.logback.appender.LogstashTcpSocketAppender">
        <destination>${MSGX_LOGSTASH_HOST:-127.0.0.1}:${MSGX_LOGSTASH_PORT:-5044}</destination>
        <encoder class="net.logstash.logback.encoder.LogstashEncoder">
            <includeMdcKeyName>traceId</includeMdcKeyName>
            <includeMdcKeyName>target</includeMdcKeyName>
        </encoder>
        <reconnectionDelay>10 seconds</reconnectionDelay>
    </appender>

    <!-- U12：异步 + neverBlock——队列满即丢弃（降级优先保业务线程），不阻塞热路径 -->
    <appender name="ASYNC_LOGSTASH" class="ch.qos.logback.classic.AsyncAppender">
        <queueSize>4096</queueSize>
        <discardingThreshold>0</discardingThreshold>
        <neverBlock>true</neverBlock>
        <includeCallerData>false</includeCallerData>
        <appender-ref ref="LOGSTASH_SYNC"/>
    </appender>

    <root level="INFO">
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="ASYNC_LOGSTASH"/>
    </root>

    <logger name="com.gzzn.omms.msgexchange" level="DEBUG"/>
</configuration>